SQL Best删除记录方式

Question

Which one is the best way to delete records from DB?

Using Spring JDBC 3.1.1

String SQL="DELETE FROM XXX WHERE USERNAME=?";

Query 1:

getJdbcTemplate().execute(SQL, new PreparedStatementCallback<Boolean>() {
            @Override
            public Boolean doInPreparedStatement(PreparedStatement ps) throws SQLException, DataAccessException {
               ps.setString(1, username);
               return ps.execute();
            }
         });

Query 2:

int deletedRecordSize = getJdbcTemplate().update(SQL, username);

Answer 1

As DELETE is an data changing operation you should call executeUpdate in your first Query anyway. This would then return int as well reducing the difference to length and readability of code.

In which case Query 2 looks shorter & cleaner.

Answer 2

Try this try catch block inside ur deleting method:

try{
                String SQL="DELETE FROM XXX WHERE USERNAME=?";
                ps = conn.prepareStatement(sql); //conn here is the usual object fro DB connection class

                ps.setString(1, username);
                ps.execute();
                JOptionPane.showMessageDialog(null,"DONE DELETING", "DONE",1);
          }catch(SQLException | HeadlessException e){

       }

Answer 3

I think both are the same according to the link

http://www.javatpoint.com/spring-JdbcTemplate-tutorial